The service has been discontinued. If you have reached this page through a website with a GreenShipping certification, that company has likely used our service in the past. It may take some companies time to remove the GreenShipper Certification from their website or to identify alternative methods of reducing their impact from shipping. used a carbon shipment calculator to determine the CO2 emissions generated by each shipment. Once the package had completed it's journey and the calculations were complete, companies would purchase carbon offsets to neutralize the shipment's effect on climate change. .